It's a nice capture and with a little more PP it could result in a really good finished piece of work. The main thing that is lacking now that the horizon has been sorted is the levels.Firstly I wouldbring out the blacks so that the runner is fully in silhouette as it is not fully black rather grey. You can do this by eitherincreasing contrast, taking down the bottom on the levels or reducing shadows. The next thing is to sharpen this up with some Unsharp mask and I would say you are there. The only other thing you might want to do and this comes down to taste is up the saturation to bring out the sunset more.